Test results released on E-15 fuel impact on snowmobiles

News release

The U.S. Department Of Energy (DOE) released a study conducted by Michigan Technological University that was designed to evaluate the effects of E-15 fuel on current and legacy snowmobile engines and vehicles.

Three test scenarios were conducted to evaluate the impact of E-15, including cold-start performance and emissions; snowmobile drivability; and laboratory exhaust emissions over the useful life of the engine. Eight engines were tested over a two-year period. The vehicles were tested in the laboratory and on the trail in real life driving conditions.

The conclusion of the testing by the DOE is that E-15 fuel is NOT approved for snowmobile use. Observations made during the study support the U.S. Environmental Protection Agency’s decision to NOT APPROVE E-15 fuel for snowmobiles.

The testing was conducted since E-15 fuel is being introduced into the marketplace and is viewed by some as an important fuel enabling the U.S. to achieve the goals of the Reformulated Fuel Standard passed by Congress.

Ethanol is being produced throughout the U.S. Ethanol producers use corn, switch grass and other related plant products in the production of ethanol. It is the directive of the present administration that 13.8 billion gallons of ethanol be produced and distributed in the marketplace. The goal is challenging because U.S. gasoline consumption is declining rapidly.

Since it appears the E-15 fuel will be made more readily available throughout the U.S., it is important that owners of snowmobiles and of other gas-powered products realize that E-15 fuel may impact the various engines.

The 69-page study highlights that one of the key issues related to snowmobiles is that exhaust gas temperatures and muffler exit temperature consistently increase with the use of E-15 fuel. The increased temperatures range from 15 to 40 percent, depending on the vehicle. This rise in temperature occurs because of the leaner air/fuel mixture.

Since it has been recommended that E-15 not be approved for snowmobile use by the EPA, there is concern in the marketplace that mis-fueling of snowmobiles can occur.  Recent surveys show that approximately 50 percent of all Americans fill up their portable gas tank or vehicles that they are towing with the same fuel used to fill their tow vehicle (car or truck). Also, approximately two-thirds of all Americans say that they assume that any gas sold at a gas station is safe for all of their vehicles — including snowmobiles, generators, boats, etc. Approximately 50 percent of Americans check the fuel pumps for warning labels when filling up their vehicles.

With various fuels entering the marketplace, it is more important than ever that customers carefully read any and all labels on gas dispensing pumps and understand the guidance messages placed on those pumps.

It should be noted that E-85 fuel has been available in the marketplace for many years.  E-85 is a blend of fuel that is designed to be used in flex-fuel equipped cars and trucks only. E-85 is 85 percent ethanol. It should NOT be confused with E-15, which is 15 percent ethanol. E-10 fuel is 10 percent ethanol and has been available and used throughout the U.S. for years and is approved for snowmobile use.



The complete study is available by clicking here.

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One Comment

  1. A statement like, “An average increase in cylinder head temperature of 2%–8% was noted and 2%–11% for the EGT” makes no sense unless temperatures were plotted on the Kelvin scale.

    Sounds good: “CO emissions were reduced on average by 37% with E15 compared to E0.”
    Sounds bad: “Formaldehyde emissions increased consistently for E15 fuel by 35%.” And by as much as 100%.
    Which would you rather be breathing? Depends on the absolute levels, which are not stated in terms of “harmfulness” of these emissions. Is any tested level harmful?

    The regulated emissions changed very little, even though run leaner on Ethanol. Is there an environmental benefit? BSFC went up (fuel mileage decreased) with Ethanol. Is there an environmental benefit? (More Ethanol-laced fuel must be stored and transported to achieve the same amount of end-vehicle travel.)

    Interestingly, one of the highest concerns of owners of seasonal vehicles was not studied: “Long-term effects of sustained usage of E15 were not studied as part of this effort. Materials compatibility was not part of the study.”
    And there’s this: “In addition, more work with the engine oil to determine if there is any effect and correlation on lubricity and ethanol content should be conducted.”

    OK — so will the EPA address this as it figures out ways to burn Ethanol we don’t need to burn, or should we trade in our sleds for snowshoes (and our motorcycles for Schwinns)?

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